EP2244122A2 - Dispositif d'affichage et procédé de préparation de particules utilisées dans celui-ci - Google Patents

Dispositif d'affichage et procédé de préparation de particules utilisées dans celui-ci Download PDF

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Publication number
EP2244122A2
EP2244122A2 EP10172134A EP10172134A EP2244122A2 EP 2244122 A2 EP2244122 A2 EP 2244122A2 EP 10172134 A EP10172134 A EP 10172134A EP 10172134 A EP10172134 A EP 10172134A EP 2244122 A2 EP2244122 A2 EP 2244122A2
Authority
EP
European Patent Office
Prior art keywords
particles
electrode
display device
display
electrodes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10172134A
Other languages
German (de)
English (en)
Other versions
EP2244122B1 (fr
EP2244122A3 (fr
Inventor
Hiroyuki Yamakita
Toshiyasu Oue
Naohide Wakita
Mariko Kawaguri
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Corp filed Critical Panasonic Corp
Publication of EP2244122A2 publication Critical patent/EP2244122A2/fr
Publication of EP2244122A3 publication Critical patent/EP2244122A3/fr
Application granted granted Critical
Publication of EP2244122B1 publication Critical patent/EP2244122B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field
    • G02F1/166—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
    • G02F1/167—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field
    • G02F1/166—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
    • G02F1/1671—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect involving dry toners
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • G02F1/1676—Electrodes
    • G02F1/16761—Side-by-side arrangement of working electrodes and counter-electrodes
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on translational movement of particles in a fluid under the influence of an applied field
    • G02F1/1675—Constructional details
    • G02F2001/1678—Constructional details characterised by the composition or particle type
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/12—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 electrode

Definitions

  • the first and second electrodes are formed at respective of the substrates.
  • the projecting portion of the uneven surface of the second substrate is formed into a matrix pattern, while the depressed portion of the uneven surface is formed into a lattice pattern circumscribing the projecting portion; and the second electrode is comb-shaped and located at the depressed portion.
  • a display device comprising: a pair of substrates disposed opposite to each other, at least one of which is transparent; a plurality of particles having an electrostatic property contained in a gaseous phase provided between the pair of substrates; first and second electrodes provided for each of pixels arranged in a matrix for driving the particles; and a voltage applying portion for applying voltage to the first and second electrodes in accordance with an image signal, wherein: the first electrode and the second electrode have respective widths which vary for every three or more adjacent pixels; and when voltage is applied to the first and second electrodes by the voltage applying portion, the particles are caused to travel between the first and second electrodes in accordance with the voltage applied so as to display an image corresponding to the image signal in display units each consisting of three or more adjacent pixels.
  • the plurality of particles have an average particle diameter not less than 1 ⁇ m and not more than 10 ⁇ m.
  • the plurality of particles comprise two kinds of particles which are electrostatically charged to have different polarities, at least one of the two kinds of particles comprising a parent particle as a core, and plural child particles fixed to the parent particle in a manner to cover a substantially entire surface of the parent particle.
  • each comb tooth portion 3a of the first electrode 3 is formed into a ridge shape projecting perpendicularly to the upper substrate 1, the strength of an electric field produced when the first and second electrodes 3 and 4 are applied with voltage is enhanced as compared with the case where each comb tooth portion 3a of the first electrode 3 is shaped flat as in embodiment 1-1. Therefore, when the first and second electrodes 3 and 4 are applied with voltage equal to that applied in embodiment 1-1, this embodiment can cause colored particles 6 to adhere to either electrode more reliably than embodiment 1-1 and, hence, the construction of this embodiment is more suitable for improvement in contrast. Stated otherwise, in this embodiment a lower driving voltage is sufficient to obtain the same level of contrast as in embodiment 1-1 and, therefore, this embodiment can lower the driving voltage.
  • Colored particles 6 travel between the first electrode 3 and the second electrode 4 as described above. However, their travel is restricted by the comb tooth portions 3a of the first electrode 3 and the ridge portions 1b of the upper substrate 1. Therefore, the amount of colored particles 6 contained in each pixel can be kept constant. Further, it is possible to prevent colored particles 6 from aggregating at a specific region when the display section 14 is tilted in a certain direction. Thus, the display device can obviate the occurrence of display irregularities thereby realizing image display of good quality.
  • this embodiment realizes white display by collecting black particles 206 into depressed portion 207b of the uneven layer 207 while refracting light with the microlens 208 so as not to allow the depressed portion 207b to be observed, thereby offering improved contrast.
  • the black display operation it is sufficient to cover up white layer 205 located at projecting portion 207a of the uneven layer 207 which can be illuminated with light and hence can participate in display. Therefore, white layer 205 can be covered up efficiently without any void.
  • this case also offers improved contrast.
  • this embodiment offers improved display quality in white display and black display both, which results in markedly improved contrast.
  • black particles 206 traveling in space 209 in both of the white display operation and the black display operation, there will not occur obstruction to travel of particles by another kind of particles, which occurs in the prior art display device using plural kinds of colored particles having different polarities as shown in Figs. 1A and 1B . Further, black particles 206 traveling in a gaseous phase has a higher traveling speed than in a liquid phase.
  • colored particles 6 preferably have a small specific gravity and excellent fluidity.
  • a specific structure for realizing such particles is constructed by fixing spherical fine particles of silica each having a diameter of 30 nm to a spherical acrylic particle having a diameter of 5 ⁇ m in a manner to cover the entire surface thereof by a mechanochemical method or a like method.
  • the fine silica particles used here are those electrostatically charged and, hence, the colored particles 6, as a whole, have an electrostatic property.
  • the acrylic particles to be used be hollow or porous.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Molecular Biology (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
EP10172134.8A 2002-10-29 2003-10-28 Dispositif d'affichage et procédé de préparation de particules utilisées dans celui-ci Expired - Lifetime EP2244122B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2002314453 2002-10-29
JP2002314005 2002-10-29
JP2002318194 2002-10-31
JP2003031218 2003-02-07
EP03256815A EP1416315A3 (fr) 2002-10-29 2003-10-28 Dispositif d'affichage et procédé de préparation de particules utilisées dans celui-ci

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP03256815A Division EP1416315A3 (fr) 2002-10-29 2003-10-28 Dispositif d'affichage et procédé de préparation de particules utilisées dans celui-ci
EP03256815.6 Division 2003-10-28

Publications (3)

Publication Number Publication Date
EP2244122A2 true EP2244122A2 (fr) 2010-10-27
EP2244122A3 EP2244122A3 (fr) 2010-11-17
EP2244122B1 EP2244122B1 (fr) 2016-04-20

Family

ID=32097016

Family Applications (2)

Application Number Title Priority Date Filing Date
EP10172134.8A Expired - Lifetime EP2244122B1 (fr) 2002-10-29 2003-10-28 Dispositif d'affichage et procédé de préparation de particules utilisées dans celui-ci
EP03256815A Withdrawn EP1416315A3 (fr) 2002-10-29 2003-10-28 Dispositif d'affichage et procédé de préparation de particules utilisées dans celui-ci

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP03256815A Withdrawn EP1416315A3 (fr) 2002-10-29 2003-10-28 Dispositif d'affichage et procédé de préparation de particules utilisées dans celui-ci

Country Status (5)

Country Link
US (1) US7495821B2 (fr)
EP (2) EP2244122B1 (fr)
KR (1) KR100973377B1 (fr)
CN (2) CN100578574C (fr)
TW (1) TWI270835B (fr)

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CN101713898A (zh) 2010-05-26
KR20040038738A (ko) 2004-05-08
CN101713898B (zh) 2013-02-13
US7495821B2 (en) 2009-02-24
EP2244122A3 (fr) 2010-11-17
CN100578574C (zh) 2010-01-06
TW200421222A (en) 2004-10-16
CN1499460A (zh) 2004-05-26
US20040150325A1 (en) 2004-08-05
KR100973377B1 (ko) 2010-07-30
EP1416315A3 (fr) 2007-04-25
TWI270835B (en) 2007-01-11
EP1416315A2 (fr) 2004-05-06

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